<template>
  <div>
      <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
          <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>商品管理</el-breadcrumb-item>
          <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>
      
      <!-- 卡片视图 -->
      <el-card>
          <!-- 提示区 -->
            <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon
                closable="false"
                >
            </el-alert>
            <!-- 步骤条区 -->
            <el-steps 
            :space="200" 
            :active="activeIndex - 0" 
            finish-status="success"
            align-center
            >
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <!-- Tab栏区域 -->
            <el-tabs :tab-position="left" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price" >
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader
                        expand-trigger="hover"
                            v-model="addForm.goods_cat"
                            :options="options"
                            :props="cateProps"
                            @change="handleChange"></el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单的item项 -->
                    <el-form-item label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox border label="cb" v-for="(cb,i) in item.attr_vals" :key="i">
                            </el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <!-- 渲染表单的item项 -->
                    <el-form-item label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- 上传图片 -->
                    <!-- action表示图片要上传到的后台API地址 -->
                    <el-upload
                        action="http://127.0.0.1:8888/api/private/v1/upload"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture"
                        :headers="headerObj"
                        :on-success="handleSuccess"
                        >
                        <el-button size="small" type="primary">点击上传</el-button>
                        <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                        </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!-- 富文本编辑器组件 -->
                    <quill-editor v-model="addForm.goods_introduce">
                        
                    </quill-editor>
                    <el-button @click="add" class="btnAdd" type="primary">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
            </el-form>
      </el-card>
      <!-- 图片预览 -->
      <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%"
            :before-close="handleClose">
            <img :src="previewPath" alt="" class="preview">
            
            </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
    dta(){
        return {
            activeIndex:'0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片数组
                pics:[],
                // 商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            addFormRules:{
                goods_name:[{required:true,message:'请输入商品名称',trigger:'blur'}],
                goods_price:[{required:true,message:'请输入商品价格',trigger:'blur'}],
                goods_weight:[{required:true,message:'请输入商品重量',trigger:'blur'}],
                goods_number:[{required:true,message:'请输入商品数量',trigger:'blur'}],
                goods_cat:[{required:true,message:'请输入商品分类',trigger:'blur'}]
            },
            // 商品分类列表
            catelist:[],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 动态参数列表数据
            manyTableData:[],
            // 静态参数列表数据
            onlyTableData:[],
            // 图片上传组件的headers请求头对象
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false

        }
    },
    created(){
        this.getCateList()

    },
    methods:{
        // 获取所有商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类数据失败');
            }
            this.catelist = res.data
        },
        // 级联选择器选中心变化触发该函数
        handleChange(){
                if(this.addForm.goods_cat.length !== 3){
                    this.addForm.goods_cat = []
                }
        },
        beforeTabLeave(acyiveName,oldActiveName){
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请选择商品分类')
                return false
            }
        },
        async tabClicked(){
            // 证明访问的是动态参数面板
            if(this.activeIndex === '1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败')
                }
                res.data.forEach(item =>{
                    item.attr_vals = item.sttr_vals.length === 0 ? []:item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }else if(this.activeIndex === '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                if(res.meta.status !== 200){
                    return this.$message.error('获取静态属性列表失败')
                }
                this.onlyTableData = res.data

            }
        },
        // 监听图片上传成功事件
        handleSuccess(response){
            // 拼接得到一个图片信息对象
            const picInfo = {pic:response.data.tem_path}
            // 将图片信息对象push到pics数组中
            this.addForm.pics.push(picInfo)
        },
        // 处理图片预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            const filePath = file.response.data.tem_path
            const i = this.addForm.pics.findIndex(x =>x.pic === filePath)
            this.addForm.pics.splice(i,1)
        },
        // 添加商品
        add(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return this.$message.error('请填写必要的表单项')
                // 执行添加的业务逻辑 lodash cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数和静态属性
                this.manyTableData.forEach(item =>{
                    const newInfo = {
                        attr_id : item.attr_id,
                        attr_value:item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                this.onlyTableData.forEach(item =>{
                    const newInfo = {
                        attr_id : item.attr_id,
                        attr_value:item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                    
                })
                form.attrs = this.addForm.attrs
                // 添加商品
               const {data:res} = await this.$http.post('goods',form)
                if(res.meta.status !== 201){
                    return thos.$message.error('添加商品失败')
                }
                this.$message.success('添加商品成功')
                this.$router.push('/goods')
            })

        }

    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }

}
</script>

<style lang="less" scoped>
.el-checkbox{
    // 上右下左
    margin: 0 10px 0 0 !important;
    
}
.preview{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>